Design for a cup



FIG. 1 is a perspective view from one side of the top and rear of a cup showing our new design, the opposite side being a mirror image;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a cup, as shown. 